File:Nematode C. elegans spermatogenesis.jpg
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| Description | Figure 1. (A). Summary of spermatogenesis. Asymmetric partitioning of cellular constituents occurs at three points during C. elegans spermatogenesis, as indicated by double-headed red arrows at the red numbers. 1, syncytial pachytene spermatocytes with many FB-MOs bud from the rachis and divide to form secondary spermatocytes (FB-MOs are shown in green); 2, spermatids selectively retain FB-MOs as they bud from the residual body; 3, FB-MOs fuse with the spermatid plasma membrane as a pseudopod extends from the cell body during spermiogenesis. Nuclei are the circles in the center of each cell. Nuclei are patterned with lines to represent stages when chromatin is in condensed meiotic chromosomes or filled (in black) after chromatin forms a single highly condensed sphere. (B) Summary of morphogenesis of the FB-MO complex. 1, The fibrous body (FB) develops in close association with, and is surrounded by, the membranous organelle (MO) within the primary spermatocyte. The MO is separated by a collar region (c) into a head (h; speckled region at left) and body (b; region to the right of the collar); 2, the FB-MO complex reaches its largest size within primary spermatocytes. The double layered MO-derived membrane surrounds the FB, which is composed of the major sperm protein filaments; 3, the MO-derived membranes surrounding the FB retract and fold up while FB filaments depolymerize and disperse as spermatids bud from the residual body; 4, the head of each MO (arrow) moves to a position just below the plasma membrane (pm) of the spermatid after the FBs have depolymerized and disappeared. The irregular shapes within the FB represent retracted membrane that had covered the exterior of the FB; 5, the head of the MO fuses at the collar to the plasma membrane and exocytoses its contents (dots at arrow) onto the cell surface. A permanent fusion pore remains at the point of each MO fusion (each cell has many MO's; B is modified from L'Hernault and Arduengo, 1992). |
| Date | |
| Source | http://www.wormbook.org/chapters/www_spermatogenesis/spermatogenesis.html L'Hernault, S.W. Spermatogenesis (February 20, 2006), WormBook, ed. The C. elegans Research Community, WormBook, doi/10.1895/wormbook.1.85.1, http://www.wormbook.org. |
| Author | L'Hernault, S.W. |
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http://www.wormbook.org/chapters/www_spermatogenesis/spermatogenesis.html L'Hernault, S.W. Spermatogenesis (February 20, 2006), WormBook, ed. The C. elegans Research Community, WormBook, doi/10.1895/wormbook.1.85.1, http://www.wormbook.org., was reviewed on 27 February 2024 by reviewer Yann, who confirmed that it was available there under the stated license on that date.
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| current | 11:22, 27 February 2024 | | 1,800 × 1,341 (632 KB) | Rasbak (talk | contribs) | {{Information |description=Figure 1. (A). Summary of spermatogenesis. Asymmetric partitioning of cellular constituents occurs at three points during C. elegans spermatogenesis, as indicated by double-headed red arrows at the red numbers. 1, syncytial pachytene spermatocytes with many FB-MOs bud from the rachis and divide to form secondary spermatocytes (FB-MOs are shown in green); 2, spermatids selectively retain FB-MOs as they bud from the residual body; 3, FB-MOs fuse with the spermatid pla... |
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